Screw fastening type three-phase current transformer for mine motor

Abstract

The utility model provides a three-phase current transformer for a spiral fastening type mine motor, which relates to the technical field of current transformers and comprises a semicircular upper half body and a semicircular lower half body. One end of the upper half body is hinged to one end of the lower half body through a hinge, and the other end of the upper half body is a free end and is opened, closed and locked through a spiral fastening assembly. Three independent iron core containing grooves are correspondingly formed in the upper half body and the lower half body and used for containing iron cores for three-phase current measurement. After measurement is completed, the unlocking ring can be driven to be embedded into the circular groove of the round cap and eject the round cap out of the locking groove of the limiting body only by rotating the spiral knob clockwise, rapid unlocking is achieved, and operation is easy, convenient and efficient.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, and more specifically, to a spiral-fastened three-phase current transformer for mining motors. Background Technology

[0002] In mining production, large motors are core power equipment, and the stable monitoring of their three-phase current is crucial for the safe operation of the equipment. As a key component for current measurement, current transformers need to adapt to the complex environment of the mining site for a long time—closed spaces, high dust levels, high-frequency vibrations generated by motor operation, and frequent movement of the transformers by workers to perform multi-point measurements.

[0003] Existing three-phase current transformers used in mines have significant drawbacks: First, they are large in size (typically with a diameter of ≥20cm and a height of ≥12cm) and weigh over 3kg, requiring tool bags for carrying and making them inconvenient to move in narrow spaces such as mine tunnels. Second, installation is complex, with most using bolt or snap-fit ​​connections. Bolted connections require tools such as wrenches, while snap-fit ​​connections are prone to loosening under high-frequency vibration. Third, motor vibration can easily cause displacement of internal components of the transformer, especially gaps at the core contact points, leading to increased measurement errors (typically exceeding ±1.5%), failing to meet the requirements for accurate monitoring. Fourth, traditional transformers lack protective structures designed for the mining environment, making the casing susceptible to dust corrosion and impact damage, thus shortening their service life.

[0004] Therefore, there is an urgent need for a three-phase current transformer that is compact, portable, easy to install, vibration resistant, and compatible with large mining motors, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0005] To address the aforementioned technical problems of large size, poor portability, complex installation, easy loosening of components due to vibration of mining motors, and low measurement accuracy, this invention provides a screw-fastened three-phase current transformer for mining motors. This invention effectively overcomes the above problems and meets the three-phase current measurement needs in mining sites.

[0006] The technical means adopted in this utility model are as follows:

[0007] A spiral-fastened three-phase current transformer for mining motors includes:

[0008] The upper and lower halves are semi-circular; one end of the upper half and one end of the lower half are hinged together by a hinge, and the other end of the upper half is a free end and is opened and locked by a screw fastening assembly; three independent iron core receiving slots are correspondingly opened inside the upper and lower halves for placing the iron core for three-phase current measurement.

[0009] The spiral fastening assembly includes: a round cap, an unlocking ring, a spiral structure, a spiral knob, and a limiting body; the spiral structure is fixedly disposed on the outer side wall of the free end of the upper body, the round cap is fixedly connected to the top end of the spiral structure, the spiral knob is threaded onto the bottom end of the spiral structure, and the unlocking ring is movably disposed on the outside of the spiral structure and located between the round cap and the upper body.

[0010] The limiting body is vertically fixed to the outer wall of the free end of the lower half. The middle part of the limiting body is provided with a guide hole for the spiral structure to pass through, and a locking groove adapted to the round cap is provided below the guide hole.

[0011] Furthermore, the overall diameter of the current transformer is less than or equal to 15cm and the height is less than or equal to 8cm.

[0012] Furthermore, the spiral structure is a trapezoidal thread, and the tooth angle of the trapezoidal thread is 30°.

[0013] Furthermore, the inner diameter of the unlocking ring is 0.5-1mm larger than the outer diameter of the spiral structure, the outer diameter of the unlocking ring is adapted to the inner diameter of the guide hole of the limiting body, and the bottom of the unlocking ring is provided with an annular boss adapted to the top of the spiral knob.

[0014] Furthermore, an annular groove is provided at the bottom of the round cap, and the inner diameter of the annular groove is adapted to the outer diameter of the unlocking ring.

[0015] Furthermore, the outer wall of the upper body is provided with an arc-shaped handle, and the surface of the arc-shaped handle is provided with anti-slip texture.

[0016] Furthermore, the inner wall of the iron core receiving groove is provided with an insulating bushing, an iron core is placed in the iron core receiving groove, and the surface of the iron core is covered with an insulating varnish layer.

[0017] Furthermore, the outer wall of the spiral knob is provided with uniformly distributed anti-slip ridges, the ridges being 1-1.5mm high, and a rubber washer is provided between the top of the spiral knob and the outer wall of the upper half, the rubber washer being fitted onto the outside of the spiral structure.

[0018] Furthermore, the inner wall of the guide hole of the limiting body is provided with a wear-resistant bushing.

[0019] Furthermore, the depth of the locking groove is equal to the height of the round cap. .

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] This utility model is small in size and highly portable: the overall diameter is less than or equal to 15cm, the height is less than or equal to 8cm, and the weight is less than or equal to 1.5kg. With the arc-shaped non-slip handle on the upper half, workers can carry it with one hand and move it easily in narrow mine tunnels and other scenarios without the need for an additional tool bag.

[0022] This utility model is simple to install and requires no tools: the upper and lower halves are hinged at one end, and after closing, the round cap can pass through the limiting body and automatically lock. The tightness of the fit can be adjusted by manually rotating the spiral knob. One person can complete the installation within 1 minute, which solves the problem of traditional bolt / clasp connections requiring tools and taking a long time.

[0023] This utility model is vibration resistant and anti-loosening: the spiral structure adopts a trapezoidal thread self-locking design, combined with the locking cooperation of the round cap and the limiting body, which can effectively resist the high-frequency vibration of large mining motors, prevent parts from loosening, ensure that the iron core is always tightly fitted, and control the measurement error within ±0.5%, ensuring measurement accuracy;

[0024] This utility model device has strong environmental adaptability: the shell is made of high-strength aluminum alloy with anti-corrosion coating, and the internal insulating bushing and rubber gasket design can resist mine dust, collision and slightly humid environment, extend the service life of the equipment, and adapt to complex working conditions in mines.

[0025] This utility model device is easy to unlock: after the measurement is completed, simply rotate the spiral knob clockwise to drive the unlocking ring into the annular groove of the round cap, and push the round cap out of the locking groove of the limiting body to achieve quick unlocking. The operation is simple and efficient. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0028] Figure 2 This is a cross-sectional view of the spiral fastening structure of this utility model.

[0029] In the diagram: 1. Round cap; 2. Upper body; 3. Unlocking ring; 4. Lower body; 5. Spiral structure; 6. Spiral knob; 7. Limiting body. Detailed Implementation

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0035] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0037] like Figure 1-2 As shown, a spiral-fastened three-phase current transformer for mining motors includes: an upper half 2 and a lower half 4 in a semi-circular shape.

[0038] In this application, preferably, one end of the upper body 2 is hinged to one end of the lower body 4 by a hinge, and the other end of the upper body 2 is a free end and is opened and locked by a screw fastening assembly; the upper body 2 and the lower body 4 have three independent iron core receiving slots inside for placing the three-phase current measuring iron core.

[0039] The spiral fastening assembly includes: a round cap 1, an unlocking ring 3, a spiral structure 5, a spiral knob 6, and a limiting body 7; the spiral structure 5 is fixedly disposed on the outer side wall of the free end of the upper half 2, the round cap 1 is fixedly connected to the top end of the spiral structure 5, the spiral knob 6 is threaded onto the bottom end of the spiral structure 5, and the unlocking ring 3 is movably disposed on the outside of the spiral structure 5 and located between the round cap 1 and the upper half 2;

[0040] The limiting body 7 is vertically fixed to the outer wall of the free end of the lower half 4. The limiting body 7 has a guide hole in the middle for the spiral structure 5 to pass through, and a locking groove adapted to the round cap 1 is provided below the guide hole. When the upper half 2 and the lower half 4 are closed, the round cap 1 can pass through the guide hole and be inserted into the locking groove to achieve initial locking. Rotating the spiral knob 6 can adjust the tightness of the fit between the round cap 1 and the limiting body 7. Rotating the spiral knob 6 clockwise can drive the unlocking ring 3 to lift the round cap 1 to achieve unlocking.

[0041] In a preferred embodiment, the overall diameter of the current transformer is less than or equal to 15cm and the height is less than or equal to 8cm.

[0042] In this application, the spiral structure 5 is a trapezoidal thread with a thread angle of 30°, which has a self-locking function and can prevent the spiral knob 6 from loosening on its own due to vibration of the mining motor.

[0043] Preferably, the inner diameter of the unlocking ring 3 is 0.5-1mm larger than the outer diameter of the spiral structure 5, the outer diameter of the unlocking ring 3 is adapted to the inner diameter of the guide hole of the limiting body 7, and the bottom of the unlocking ring 3 is provided with an annular boss adapted to the top of the spiral knob 6.

[0044] In this application, the bottom of the round cap 1 is provided with an annular groove, the inner diameter of which is adapted to the outer diameter of the unlocking ring 3. When unlocking, the unlocking ring 3 can be embedded in the annular groove to push the round cap 1 out of the locking groove of the limiting body 7.

[0045] In a preferred embodiment, both the upper body 2 and the lower body 4 are made of high-strength aluminum alloy, and the shell surface is provided with a 0.2mm thick anti-corrosion coating. The outer side wall of the upper body 2 is provided with an arc-shaped handle, and the surface of the arc-shaped handle is provided with anti-slip texture.

[0046] In a preferred embodiment, the inner wall of the iron core receiving groove is provided with an insulating bushing made of polytetrafluoroethylene, and the iron core placed in the iron core receiving groove is made of high silicon steel sheets stacked together, and the surface of the iron core is covered with an insulating varnish layer.

[0047] In a preferred embodiment of this application, the outer wall of the spiral knob 6 is provided with uniformly distributed anti-slip ridges, the ridges being 1-1.5mm high, and a rubber washer is provided between the top of the spiral knob 6 and the outer wall of the upper half 2, the rubber washer being fitted onto the outside of the spiral structure 5.

[0048] The guide hole of the limiting body 7 is provided with a wear-resistant bushing, which is made of copper alloy, and the depth of the locking groove is equal to the height of the round cap 1. .

[0049] As one embodiment of this application, when using this device, the user carries the current transformer to the side of the large mining motor through the arc-shaped handle of the upper half 2. First, the upper half 2 is rotated around the hinge to open, and the three-phase cables of the motor are respectively placed into the three iron core receiving slots of the lower half 4. Then, the upper half 2 is closed so that the iron core receiving slots of the upper half 2 are aligned with the iron core receiving slots of the lower half 4, and the iron cores are tightly attached to the cables.

[0050] During the closing process, the spiral structure 5 moves with the upper half 2, and the round cap 1 passes through the guide hole of the limiting body 7 and finally gets stuck in the locking groove below the guide hole, realizing the initial locking of the transformer. If the vibration of the motor is felt at this time, causing the upper half 2 and the lower half 4 to not fit tightly, the operator can manually rotate the spiral knob 6 counterclockwise. The spiral knob 6 moves upward along the trapezoidal thread, pushing the unlocking ring 3 to press the round cap 1 tightly, so that the round cap 1 fits more tightly with the locking groove of the limiting body 7, thereby driving the upper half 2 and the lower half 4 to press together, ensuring that the iron core has no gap and ensuring the accuracy of three-phase current measurement.

[0051] After the measurement is completed, the staff rotates the spiral knob 6 clockwise. The spiral knob 6 moves downward along the trapezoidal thread, and the unlocking ring 3 moves down and is embedded in the annular groove at the bottom of the round cap 1. Continue to rotate the spiral knob 6, and the unlocking ring 3 pushes the round cap 1 out of the locking groove of the limiting body 7. At this time, the upper body 2 can be opened, the current transformer can be taken out and carried to the next measurement point.

[0052] In dusty mining environments, the anti-corrosion coating on the shell surface can prevent dust erosion, and the copper alloy wear-resistant bushing inside the guide hole can reduce the wear of the spiral structure 5. If long-term use is required, the sealing of the rubber gasket can be checked regularly to ensure that the internal iron core is not affected by dust and to extend the service life of the transformer.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A three-phase current transformer for a screw-fastened mining motor, characterized in that, include: The upper half (2) and the lower half (4) are semi-circular. One end of the upper half (2) is hinged to one end of the lower half (4) by a hinge. The other end of the upper half (2) is a free end and is opened and locked by a screw fastening assembly. The upper half (2) and the lower half (4) have three independent iron core receiving slots inside for placing the three-phase current measuring iron core. The spiral fastening assembly includes: a round cap (1), an unlocking ring (3), a spiral structure (5), a spiral knob (6), and a limiting body (7); the spiral structure (5) is fixedly disposed on the outer side wall of the free end of the upper half (2), the round cap (1) is fixedly connected to the top of the spiral structure (5), the spiral knob (6) is threaded onto the bottom end of the spiral structure (5), and the unlocking ring (3) is movably disposed on the outside of the spiral structure (5) and located between the round cap (1) and the upper half (2); The limiting body (7) is vertically fixed to the outer wall of the free end of the lower half (4). The middle part of the limiting body (7) is provided with a guide hole for the spiral structure (5) to pass through, and a locking groove adapted to the round cap (1) is provided below the guide hole.

2. The three-phase current transformer for mining motors with spiral fastening as described in claim 1, characterized in that: The overall diameter of the current transformer is less than or equal to 15cm and the height is less than or equal to 8cm.

3. A spiral-fastened three-phase current transformer for mining motors according to claim 1, characterized in that: The spiral structure (5) is a trapezoidal thread, and the tooth angle of the trapezoidal thread is 30°.

4. A three-phase current transformer for mining motors with spiral fastening as described in claim 1, characterized in that: The inner diameter of the unlocking ring (3) is 0.5-1mm larger than the outer diameter of the spiral structure (5). The outer diameter of the unlocking ring (3) is adapted to the inner diameter of the guide hole of the limiting body (7). The bottom of the unlocking ring (3) is provided with an annular boss that is adapted to the top of the spiral knob (6).

5. A three-phase current transformer for mining motors with a spiral fastening system according to claim 1, characterized in that: The bottom of the round cap (1) is provided with an annular groove, the inner diameter of which is adapted to the outer diameter of the unlocking ring (3).

6. A three-phase current transformer for mining motors with spiral fastening as described in claim 1, characterized in that: The outer side wall of the upper body (2) is provided with an arc-shaped handle, and the surface of the arc-shaped handle is provided with anti-slip texture.

7. A three-phase current transformer for mining motors with spiral fastening as described in claim 1, characterized in that: The inner wall of the iron core receiving groove is provided with an insulating bushing, the iron core is placed in the iron core receiving groove, and the surface of the iron core is covered with an insulating varnish layer.

8. A three-phase current transformer for mining motors with spiral fastening as described in claim 1, characterized in that: The outer wall of the spiral knob (6) is provided with uniformly distributed anti-slip ridges, the height of which is 1-1.5mm. A rubber gasket is provided between the top of the spiral knob (6) and the outer wall of the upper half (2), and the rubber gasket is fitted on the outside of the spiral structure (5).

9. A spiral-fastened three-phase current transformer for mining motors according to claim 1, characterized in that: The guide hole of the limiting body (7) is provided with a wear-resistant bushing.

10. A spiral-fastened three-phase current transformer for mining motors according to claim 1, characterized in that: The depth of the locking groove is equal to the height of the round cap (1). .

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